Some commercially available compost bins have their own systems or devices for turning over the compost. Some have harvesting trays or mechanisms for easier harvest. But those things are just add-ons and are made for added convenience for the consumer. You really dont need such stuff. All you need is basic enclosures to keep the compost materials from being scattered around the area.
Possibly the only limitations you have in making your compost bin is the amount of imagination and ingenuity you have. Fortunately, you can look in your storage room or garage and look for suitable materials and most likely you will find some quite suitable ones. They can be made from heavy plastics or wood or tin. Like I said, its just a matter of how you handle the paints to create a masterpiece.
One of my suggestions would be using a wire mesh, a couple of wood planks or even pipes. The idea would be like creating a simple wired fence around your compost pile with the pieces of wooden plans or pipes as support. You can tie the wire mesh to the pipes or planks to make it more secure. The shape is up to you. You can make it round, square, rectangular or even triangle shaped.
Just keep in mind that you will need to have quick access to the compost pile to turn it over at least once each weak. You can create a doorway from the wire mesh or you can make your enclosure in such a way that you can easily lift and put back the whole enclosure.
Also, if you have some left over wooden slats from an old fence or wooden planks from an old shed, Im sure you can assemble a quite sturdy compost bin in your backyard. Just make sure to let the air in by allowing spaces between the wooden boards. This will keep the air flowing inside the compost pile make decomposition quicker. If you have enough loose boards lying around, you can create a dresser-type compost bin complete with a door with hinges for easy access to the compost pile.
You can even fashion one from your garbage can. Look for an old can where you can afford to experiment without being scolded by your wife or your mother later one. What you need to do is punch a couple of holes in your garbage can to allow the air to circulate in the soon composting materials. You just put your composting materials inside the can. Before you cover it, wet the materials inside until they appear damp.
You can turn over or roll it around to let the materials mix while always keeping the compost pile damp. When storing the trashcan compost bin, if would be best to place it above ground. In a month or so, you should be able to get satisfactory results from all your effort.
You see, making your own compost bin is very easy. You just need to consider the following fundamentals: air should flow inside the bin, you should have quick access to the compost pile, and you should be able to wet the pile when needed.